270 PALEONTOLOGY OF NEW JERSEY. 
ing about a fourth of an inch between the whorls. The tube in its present 
condition is ereatly compressed vertically, so that the height is only about 
two-thirds as great as the transverse diameter, and the back shows a decided 
crushing of the tube in the sharply angular dorsal crest of the specimen, 
which was undoubtedly rounded in its normal condition. The surface of 
the cast is marked by transverse undulations or ridges, which are rather 
sharply curved backward on the upper surface in their passage from the 
umbilical edge to the outer one, and less strongly curved forward on the 
under side of the volution. Near the position of the center of the outer 
surface of the volution there has apparently been a line of rounded nodes 
situated on the ridges, but not, however, on each one, and another series of 
nodes at about one-third of the width of the volution within the edge on 
the under side. At this inner line of nodes almost every second and third 
ridge unites, forming a single ridge from that point to the umbilical cavity, 
within which they appear to become obsolete. 
A second specimen, also avery much flattened cast of what seems to 
have been the deflected outer part of the tube, has lost the nodes, and also 
to a very great extent the bifurcation of the coste, as on this part of the 
shell they form more regular encircling ridges, as the straightening of 
the tube relieves the crowding at the umbilical edge. A third specimen, 
quite lately obtained, consisting of the outer chamber and the deflected part 
of the tube, shows this part to have been suddenly bent obliquely down- 
ward to a length of 24 inches, when it is abruptly bent upward again in 
the same plane and nearly upon itself, so that the extremity of the tube, 
or aperture, must have been nearly under the umbilical portion of the older 
shell) The tube of this specimen is nearly circular, being a trifle higher 
than wide, the ridges are strong and distinct, and the two lines of nodes 
more easily observed; although owing to the deflection of the tube and its 
irregular growth the bifurcations take place quite irregularly and the nodes 
are also quite irregularly scattered, but always on the outer surface of the 
tube. 
Septa comparatively unknown. The last one shows imperfectly on 
the last specimen mentioned. There is apparently a rather large siphonal 
lobe with a strong branch on each side of the rather large siphon, which is 
